Unit-1 Quiz1

Benzene undergo substitution reaction more easily than addition reaction because-

• It has a cyclic structure

• It has three double bonds

• There is delocalization of electrons

• It has 6 H atom

The best sequence to form propylbenzene from benzene is-

• Friedel Craft's alkylation using 1-chloropropane and AlCl₃

• Friedel Craft's acylation followed by reduction

• Electrophilic addition of 1-chloropropane

• Nucleophilic aromatic substitution using Grignard reagent

What is electrophile in the electrophilic substitution reaction of benzene using HNO₃ and H₂SO₄

• SO₃

• NO₃

• NO₂⁺

• NO⁺

Which of the following substituent is an o- and p- director and ring deactivating-

• NH₂

• Cl

• OCH₃

• OH

Nitration of benzene requires which of the following catalysts?

• FeCl₃

• H₂SO₄

• H₂O

• Ni

DDT is no longer used in agriculture because-

• it is an insecticide

• it increases crop yields

• it decreases the spread of malaria and typhus

• it resists biodegredation

An NH₂ substituent in an aromatic ring is:

• activating, and meta-directing

• activating, and ortho- and para-directing

• deactivating, and meta-directing

• deactivating, and ortho- and para-directing

Which of the following is not associated with electrophilic aromatic substitution?

• The formation of nitrobenzene

• The formation of benzyne

• The formation of bromobenzene

• The formation of benzene sulfonic acid